Box-making machine.



E. C. NORTHRUP.

BOX MAKING MACHNE.

APPucATloN FILED FEB. 15. 191 1. RENEWED MAR.3\.1913.

Patented June 29, 1915.

E. c. NORTHBUP.

BOX MAKING MACHINE.

`APPLICATION FILED FEB. l5. 19H. RENEWED MAR. 3i. 1913.

351449497.. Patented-June 29. 1915.

SHEETS-SHEET 2.

7; '26 W o mm nummnuumnm v Inniw* E. C. NORTHRUP.

BOX MAKING MACHINE.

APPLICATION FILED FEB. 15. 1911. RENEwEDr/1AR.31,1913.

LMAQ Patented Jun@ 29, 1915.

8 SHEETS-SHEET 3.

E. C. NORTHRUP.

BOX MAKING MACHINE.

K APPLICATION FILED FEB. I5, I9II. RENEWED IIIAR. 3I, 1913. Li-AW@ Patented June 29, 19M.

8 SHEETS-SHEET 4.

E. C. NORTHRUP.

BOX MAKING IVIACHINE. APPLICATION FILED FEB. I5, 19H. RENEWED MAR. SI, I 9I3.

Lpgo Patented June 29, 1915.

8 SHEETS-SHEET 5. l@ Q9.

III-107 E. C. NORTHRUP.

BOX MAKING MACHINE. APPLICATION FILED FEB. I5. IQII. IIEIIgwEIJ IIAII'. aI. |913.

l Patented June 29, 1915.

"a sIIEETs-SIIEET e.

E10. NORTHRUP.

BOX MAKING MACHINE.

APPLICATION FILED FEB.15,1911. RENEWED1.1AR.31.1913.

8 SHEETS-SHEET IIIIIII I III E C. NORTHRUP.

Box MAKING MACHINE.

APPLICATION FILED FEB. I5. 1911.

LIMA?,

RENEWED HAR.a1,191`3.

PatentG/d June 29, 1915.

8 SHEETSwSHEET 8.

and the bars guiding the lower edges vof provided, that for the ends or heads being designated 1 and that for the sides 2 and that for the bottoms 2, the bottoms 2n being wider than the sides 2. The sides 2 and 2a are assembled in the machine in a pile at Aone point,'while the heads 1 are assembled in two diiferent piles at each iside* of the carrier mechanism. The pile of sides'is arranged between two side plates 3 and rest upon horizontal plates 4 which form ways upon which' vthe lowest piece of shookis moved 'forward into nailing position' at, the proper time by the carrier mechanism. VThe heads 1 are arranged vertically in ,inclined chutes 5, see

Fig. 4, so that they feed by gravity, delivering heads at each side of the carrier mecha-A nism in proper positionfor being 'carriedforward, the lowermost head resting against.-

horizontal bars 6 and 7 ofl the frame, the bars 6 guidin the upper edge of the heads the heads.

rIhe mechanism which carries the shookyfor the sides forward into nailing position comprises a cross head, see Figs. 2, 3, .4, 5 and 9, which comprises two blocks 8, which rspectively slide on horizontal bars 9, the blocks 8 being provided with gibs 1.0 for taking up the wear. The blocks 8 are connected .by an arbor 11 which is connected by two longer arm 17 being pivoted at 18 to the bracket 15 and the shorter arm 16 being pivoted at 19 directly to the arm 17. The short arm 16 has a lug 20 projecting from its upper edge which acts against the edge of a side'to push the latter in when the arm 16 is operated for. that function, while the arm 17 has a lug 21 which acts to push a button in when the arm 17 is operated for that function, as will be described. As clearly shown in Fig. 23, a pin 22 projects from the long arm 17 over the upper edge of the short arm 16 and a pin 23 projects from the short arm- 16 and is connected by an extension spring 24 with the pin 22 and serves to hold the short arm 16 so that its upper edge is par allel withthe long arm 17, the pin 22 acting as a stop to limit the upward position of the short arm 16.

Projecting'frorn the arm 16 is a boss 25y carrying a roller 26 which is adapted to ride underan arm 27 which projects from a vertically 'sliding vframe 28, (see Fig. 2), the frame 28 having slots 29 which are guided by studs 30 and having an arm31 with a roller 32 `which.i's operated by cam 33 in a manner to be described.` The arm '27 has a boss 34 which is adapted 'to rest' under a projecting bottom, "as illustratedsin 3 to support the latter` as the bottoms are usually in two or more pieces andlif a narrow piece happens to be at the rear it would not be supported sufficiently by the contiguous side pieces and would fall `downwereit not for the supportin bosses 34.

Each of the arms 1g? has .a shoulder 35 on` its underside which is adapted to be engaged by a latch 36 which ispivoted at37to the block 8. The spring 38 connects the latch 36 with the end of the lever 17 and'normally holds the latch 36 with -its end under the shoulder 35'supporting the arm 17 andalso holds a toe 17 on,thearm 17 against a rib 1'7bwhich'holds the arm 17 in a horizontal position. .o

. 39 is a stop pin against which a toe 40 of the 4latch36 strikes.

Projecting from the lever 17, as shown in Fig. 24, is a boss41 with a roller 42 which is adapted to ride on a track 44, (Fig. 2), whereby as the blocks `8 move rearwardly, the arms 17 will be lifted ,as the rollers 42 ride up the inclined portion of tracks 44.

behind the rear edge of a'side or bottom` whichenables the boss to engage behind the rear edgeV of the side or bottom and push,

the latter forward as the arms 17 and 16 190 This lifting movementof the arms 17 does v advance and thus move the sides or bottoms Y into nailing position. During their forward movement the arms 17 are supported by the latches 36, but when near the termination of their forward movement, the

latches 36 strike adjustin' screws 45 which disengage the latches 36 rom shoulders 35, permitting the arms 17 to lower somewhat so that as they move back they are not in engagement` with the side or bottom and thus do not drag it back. During this movement the arm 17 is supported solely by the stiff spring 38 and the upper ends of the latches 36 rest 'against faces 46 of the shoul# ders 35 and are ready'to be snapped by spring 38 'into' position again' under shoulders 35 as soon as arms 17 4 arefagain lifted. The shock carrier just describedv has a vari-` able length of stroke and 4in moving back "during each'stroke it moves back far enough for the bosses20 and 21 to engage the rear edge of a side or bottom. During -each third stroke, however, it is caused to move back slightly farther `for a reason to be described. This movement is accomplished by a carrier regulating mechanism which comprises a laterally extending pin 47 which is swiveled yin .arm 13 and slidable diametricallythrough the pin 47 is a rod 48 which is connected with. an eccentric strapy 49 on an eccentric 50'on the shaft 51. A compression spring 52 on the'rod 48 serves to act against the arm 13 and push back the latter as the rod 48is moved-in that direcserve to pullthe arm t13 forwardly. The arm 13 is thus moved rearwardlyi by` avyielding element and in order to vary its' stroke, it is simply necessaryto arrestits rearward movement which is accomplished by ax roller 54 on the arm 13 striking against.raoam/ 55r` ona shaft 56, the' cam 55 having'a cutaway portion 57 Awhich receives the roller 54 xat every third stroke 'and-permitsfthe arm '13 to move the required'farther-distance 'rearward. During the other two strokes the roller 54 hits against the concentric portion of the cam 55 andv arrestsfurther rearward movement ofthe arm 1'3, while-the spring 52 is compressed by the rearwardl'ymoving rod 4S. The shaft 56 is driven :a sprocket 58 connected by a' chain 59-onsprocket'60 on shaft 61. 62 is an idler for taking up slack in chain 59. The shaft'i51iis driven b v a geary 63 which inturn is drivenfby -a pinion 64 on themain driving shaft'\65.

The heads 1 yare moved forward, two at f ai time, by dogs 66 pivoted at 67'? t`each'b1ock 8, each dog having :si-shoulder t68, which rests against a stiff flat spring 69 projecting from the bracket 15 and each dog has xa pin 70 whichis connected by an 'extension spring 71 with-the similar pin ontlre opposite dog. As clearly shown in=Fig- 10, during the backward strokeof the 'carria eth'e dogs 66 swing inward 'and slideovert e inner face of theinnermostfheadsd until-they arrive at the rearV edge of the head whenl the dogs snap outwardly,'beinglplledvby the spring 71 and thus` engage behind the'edges ofthe two heads 1, so that as the'earria'ge moves forward the heads '1"will1be advanced into the position v'shown in Fig. 10. Itis only at every third rearwardniovement'of the carriage thatvthe dogsaremove'd loaf-ik far enough to engagetherear edges' of thel heads; during the otherftwo rear movements of the carriage the dogs are only moved to approximately the =position 'shown fby 'the dotted lines in Fig. 10- and thus'simply-slide idly over the inneracesfoflthe heads without moving the heads forward. It sometimes happens that pitch -or a projecting knot will cause a head to stick and 'thus were not some means provided fer1permitting the dog to yield, breakagewould occur. To this end, I have provided the dat springs 69. Each spring69 isstidenough to supv port its dog 66 in extended position and prevent it from swinging'frearwardly'when opposed `by the normal resistance'of a head against being pushed forward; but, if the head sticks or catches, thespring 69 -will yield and let the dog 66 swing out 'and thus ride freely forward over-the innerfa'ce of the head 1, 'thereby avoiding'breakage or damage to the machine.

As the heads 1 aremoved forward, they are pushed between --two pairs *of turning disks 72 and'72P-,1'see Figs. 9 iand 10. The two innermost kdisks 72 are yieldingly pressed =outward toward .their 'adjacent heads by -a 'single fcoil spring '73 which presses against Ta 'sleeve -74'on 'a shaft '-75, the sleeve 74 beingljonrnal'ed in bearings 76 ona frame 821'and the disk T2 bein'gffree-to turn on-sleeve '74. Gne'outer disk A72a 'is mountedbn ashortA shaft l77 which isfjournaledin a'bearing f8-and 'isf-also slidable therein andeariiesa sprocket 79; whi-lethe other disk72a iis mounted on ashraftf? journaled-in'a bearing-'78,but has'noend play; said -shaft'falso carries aspro'cket' 79. The sprockets-79 1are conneetedby chains S0 with sprockets T81 onltheshaftdl, driven in-'av manner' tofbel explained Ars-shown in Figs. 11 land 12, between the fend of one of rthe shafts '77 and' a framebracket `83 -is a wedge rod '84 which -when Lmoved upwardly will act' against thev end dfthe 'shaft 77 to move thesame inwardly,thus movingits dis-k 72a' y toward the disk7'2fnndwh'en then-*edge rod 841is=moved downfit releases'the shaft 77 and permits the latterto y'moveoutwardly. The Wedge rod'84`ispivotallyxconnected at its lower end to a link 85, asshownin Fig. 11, and a groller "86 onth'e end of link '85 operates-onf'a cani '87 mounted on'the main shaftl. Thefa'ce of the cani 87 is so proportioned xthat the wedge rod 84 `will vbe devised 'means for relaxing-the pressure "of Y the disks to Y permit lthe ibox rto be "easily ejected whenf'inished. l

The shaft 61, previously 'referred "to, is driven b 'v a starewheel-*88, seeFi'g. 7, which l is provided l`with six vteeth,"eve`ry'alternate third 4tooth having transverse Alpin 89. Mountedonth'e shaft 151 are-two large cams 90 `and 91, the earn 91, vasshown-in Fig.'6,

` being adjacent th'efstar-wheel 88, the cam 90 being on theppp'oste side ofl the machine. The oafm 91hastwbroliers 92- aJnd 93 which are adapted to operate *the star-wheel, each roller 'a'ctwatinnr the -starewheel one-sixth, so'that "for each complete'revolution ofthe cam 91, vthe star-'Wheel having been acted upon by both froll'ers 92 and 93 will have been turned one-third around. In order to lock-the star-wheel 'S8 from rotation when not being: operated by rollers 92 and 93, l

i provide a retaining pawl 94 pivoted at 95 vand having a notch 96Nto engage pins 89 and having a curved -finger 97.

In operation, the notch` 96 during twothirds ofthe revolutionof the cam 91 engages the pin 89 and holds the star-wheel from rotation and as the first roller 92 'and commenced to turn it,jthe rolleri 93 had moved lunder -the retaining pawl 494 fand lifted the latter, so that it would Vnot pre-A ventthe rotation of the -star-vivheelkbyA the irst roller 92. Assoon asthe first roller 92v has released its arm ofv the star-wheel, the second roller 93- has |been, moved into-en gagement with th'e succeedingarm off the star-wheel and turns the latter one-sixth,

whereupon the retaining pawl 94 drops-and.

notch 96 engages the next pin 89. 4 In this manner the shaft 82 is turned one-third' of a revolution for each'revolutionof the big cam.` 91. @The othersideof the cams 9d-,and 91 have cam faces 9.8' foroperating a'rms 99 which operate nail cut-off mechanism. As

the nail cut-'off mechanism forms no part of?v the present invention',l description of the same is'o'mitted, it being 'claimed inanother- 'application of mine'iled Feb. 15, 1911, Se"

rial No. 608,816. In order to support the heads of the box in nailing position, tables a roller? 102 which engages a cam' 103 on a shaft 104. Each table has three faces a, b,

and c". On the shaft 104 is a star-wheel 105` which is operated by rollers`106 and-'107 on'the inner side of cam 90, see' Figs. 1 and 11, the star-wheel 105 being turned one sixth by the roller 107 during .onesixth revolution of the main shaft 51, yand remains stationary during one-third movement of the main shaft 51, whereupon roller 106 engages star-wheel 105 and Iturns'the latter another one-sixth of a revolution and the f star-wheel' thenremains stationary, while the main shaft 51 turns two-thirds of a revolution.v As the star-wheel 1,05 and shaft 104are thus' operated, the cams 103 Aact upon the rollers 102 to swing the' tables -100into the proper position for supporting thebox or out of position under the box for releasing'the same; thus, when the tables 100 are in a position such that the heads 1 rest upon the faces b of the tables, the box is supported during the nailing of the first side, then the star-'wheel 105 is operated one- .f100 are provided', each being pivoted on a shaft'101, see Figs. 1, 2, 13, 14 and ,15. De. pendinr from the front end of each shaft 1ssixth of a revolution and the tables 100 swing out to' free theheads -1 and permit .the partially completed boxlto be turned: by.

thefturning mechanismI before described. *I

Then theztableslOO are moved in by cams 103 being operated by a one-sixth movement of the star-wheel, and the heads rest on faces a, while the bottom is being nailed,

then the star-wheel isl again turned' onesixth which releases` the :tables `from the box.k and-the kvbox is turned wand the: star-e vand again one-sixthiandthroughthe "cams 103 moves the tables- 105 inwardly "bring-y ing the faces b again. into position in time to support the incoming heads. At the in.

ner endof each shaft;101is an arm 108 rigidlysecured theretowhile the table 100 has-an arm 109fwhich is connected with the arm 108 by coiled spring 110, the lhub of the table `100 having 'a' shoulder 111, as clearly shown in Fig.;15, which acts as a stop for a shoulder 112A on the hub of the arm .10,8 to limit the forward positionA of the tables, but permitting Athe tables to -yieldingly swing back stretching the springs 110. This constitutes a safety device whereby` the springs 11.0,-although being strong enough `to normally .cansefthe tables 100 to oscillate with the shafts?101,;willryield if .the tables in swinging forward shouldhappen to strike the box before the latter had been turnedand thus prevent damage. In

order to prevent the` shaft 104 fromrotat- '105 4 ing except when actuated by the star-:wheel 105, I provide a friction bracketv` consisting l of'a drum 113,-see Figs. 2- and 13, which is secured to the1shaft104 and a bracketband 114 passes overit, one end being held'back of a compression spring 115 which .is retained bya nut;116. onv a bolt-117, so thatv by! .adjusting the'y nut:r 116, the tension of spring 115 and pressure of bracket bandf 114 against the drum 113 may be regulated. Sometimes in .pushingabottom or side forward,v vtwoof. them"will stick together,V

caused sometimes by pitch between them or a knot,.and to' prevent damage I havey provided afsafety gate 118 which is normally held in averticalpz'isition` by compression springs'119, with-"its'flower end acting as a stop to prevent the'piece next to the last piece frommo'ving out, but if the piece next to vthe bottom-jpiece should stick and move out with the bottom piece, the springs y119 will yield-and permit the gate 118 to swing outwardly allowing the passage of the two pieces without 'doing any damage to the machine. A bracket-...1120. is arranged back ofl the pile of: sides and bottomsto. guide themwhen being yfed intothe machine and hold i them from, disanrangementl when piled.

Another form of clampingy mechanism isy is a sliding collar 126- Within which is al compression sprin .127 which bearsagainst the end.of the hu 122.y Toggle levers 128 are pivotedtothe respective sleeves. 126 and connected to.a.yoke 129.which slides transverselyomthe shaft.123:and Whicltis connected'by.a rod.10 with a. pivoted; :arm 13,1,

the endof 'wliic.h.1ides on a,cam 132hav ing. two wide camfaces lxand a narrower cam. face-134g the cam,132being mounted on a shaft 135 on which is a gear 136 driven` by an. intermediate gear 137. on an arm 138, and thegear 137 is driven by a pinion 139. Asthe'camf132 operatesthe arm 131, the rod 130fis reciprocated, which operates thetoggle levers128. .and causes the latter to press out the disks-*121, and the disks 121 being. arrested-by-the box, the springs. 127

become compressed by. thestraightening ofA the toggle levers 128, thereby producing the requisite amount; of pressure against the box. When the toggle relaxes, the disks 121. arereleasedfrom their maximum pressure againsti the box, although the springs 12.5.still: hold. thedisks. 121i with a certain amonntof; pressure against; the box sufficient to. prevent. it.. from being* dislodged accidentally and enabling it to. be. easily pushed ont. when. linished. When. new headsare being pushedsin between the disks, the disksare.held-imposition bythe springs 125 only, as. the-toggle at that time iS Ilot straightened andibereis nopressure from the springs 127. The cam .134 acts to hold the toggle'straightened and the disks .firmly press against the box` duringI that part of the cyclel of operations. in whichI nailing only takes place, while lthe cams 133 in turn hold the toggle straightened; and' the disks in clamping position during those tivoparts in.the-cy,cle of operations wherein. the box is, nailed and turned.v -A-t. intermediate,

points. between. these three positions, the toggle is relaxed, w-hile the only pressure exertedby the clamping disks. is that produced by lthe springs 125.

Figs. 19v to 2 2, inclusive, show another form 'of table in which140 designates the tables, each table being mountedon a frame 141, the frame 141 being mounted to rock on a shaft 142.f 143 is a sleeve on shaft 142 with a. projecting arm144 which is connected by a spring 145 with the frame 141.

e5 0n the end of the arm 144 is aspherical roller 146 engaging in a cam 147. 148 is a lug on the sleeve 145 which engages in front 'of Lthe frame-141 and serves to move the frame 141 and table 140 outivard when the shaft 142 is. moved in that direction by the @1111.147 and the lug 148 also acts as a stop to properly position the table 140 when in either. one ofy its three inner positions, as determined 'by the cam 147.` At the same time thelug 148 does not prevent the table 140 from moving outwardly and yielding inrthe event that thebox should not have turned when thetable swings back, thereby forming a safety. device which prevents breakage of. the machine.

What I- claim is: v

1. Inabox making machine, a star Wheel, mechanism operatedthereby fori turning the box,A a. shook. carrier, carrier.v regulating mechanism,A nail. cut-off: mechanism, and a single cam for. operating the foregoing ele- Inents.- l

.2. In a box making machine, means for. turning the box comprisingy two pairs of clamping disks, means for yieldingly pressing themembers of each pair of diskstoward each other. to frictionally hold the head of the box while the heads are `being moved into position between. the clamping disks andduring the turning thereof, and means for automatically reducing the yielding pressure of said disks against. the heads after-the last turning mov-ement to.permit the box to be easily disengaged. from the 1 clamping disks.

3. In a box. making machine, meansfor feeding the heads forward comprising a piroted dog arranged-to engage behind the edge of a headfto push. the same forward and lcapable of yielding inboth directions, and stily yielding means for stronglyy supporting the, dog against yielding in one direction but permitting it. to yield in that direction under an excess of resistance from the headzto allow the dog to .swing backr free from the resisting head and be moved fors ward without carrying the head with it.

4. Ina box making machine, table means supporting the box, box turning mechanism, means for moving the table from the box to permit the box to be turned, a star-wheel for operating the box trirning. mechanism,

-an'd means for positively.I locking said starclamping disks, two inner clamping disks,

means slidably supporting the two inner disks, and a compression spring between the inner disks tending to force the inner disks toward the outer disks.

7. In a box making` machine, two outer disks, two inner disks, a shaft on which the two inner disks are slidably and revolubly mounted, and a compression spring between 10 the two inner disks for forcing them outwardly.

8. In a box making machine, two outer disks, two inner disks, a shaft on which the two inner disks are slidably and revolulolyl mounted, a compression spring between the two inner disks for forcing them outwardly, and means for permitting one of the outer disks to move longitudinally.

9. In a box making machine, two outer disks, two inner disks, a shaft on which the two inner disks are slidably and revolubly -mounted, a compression spring between the two inner disks for forcing them outwardly, a shaft supporting one of the outer disks,

said shaft being movable longitudinally, a wedge bar bearing against the end of said shaft, and means for operating said wedge bar to hold the shaftv from endwise move, ment or permit endwise movement according to the position of the wedge bar.

10. In a box making machine, a pair of brackets, sleeves in said brackets, a shaft with'its ends in said sleeves, inner clamping disks on the respective sleeves, a compression spring between said sleeves forcing them apart, and outer clamping disks opposite the respective inner disks.

11. In a box making machine, means for feeding the box heads forward comprising a 40 carrier, dogs pivoted on the carrier and arranged to engage behind the edges of the box heads, each of said dogs having a shoulder, and a stiff flat spring secured to the carrier and bearingagainst said shoulder and normally holding the dog in working posi tion, said spring being of such strength as to yield and permit the dog to rotate out of engagement 'with the box head if the pressure of the box head against the dog is more than the normal pressure.

12. In a box making machine, means for feeding the heads forward comprising a carrier, dogs pivoted on the carrier and arranged to engage behind the edges of the heads, each of said dogs havinga shoulder, a stiff fiat spring secured tothe carrier and bearing against said shoulder, and a coil spring connecting said dogs and holding their shoulders against said fiat spring.

13. In a box making machine, box turning mechanism, a star-wheel for operating the box turning mechanism, and means for positively locking said star-wheel after the turning of. a box, comprising a notched pawl, a pin on alternate arms of the starwheel arranged to engage the notch in said pawl, and a' pair of rollers mounted to swing in a path to coperate with the arms of the star-wheel, one of said rollers acting to lift said pawl out of engagement with the 7o pin of an arm of the star-wheel when the following roller reaches the succeeding arm of the star-wheel to permit the star-wheel to be turned by the latter roller.

14. In a box making machine, means for supporting the box comprising a pair of pivoted tables, each of Saidtables having a plurality of faces, a shaft, a pair of cams on the shaft, a pair of shafts extending transversely of the irst shaft, said tables being so mounted on the two transverse shafts, ,a hub fixed on each of the transverse shafts, a roller carried by each of said hubs and engaging one of said cams, and yielding means between each hub and its associated table for operating the table in one direction.

15. In a box making machine, means for supporting the box comprising a pair of pivoted tables, each of said tables having a plurality of faces, a shaft, a pair of cams on the shaft, a: pair of shafts extending transversely of the first shaft, said tables being mounted on the two transverse shafts, a hub fixed on each of the transverse shafts, a roller carried by each of said hubs and engaging one of said cams, yielding means between each hub and its associated table for operating the table in one direction, and a clutch between each table and the aforesaid shaft, whereby each table is moved positively in the other direction with said shaft.

, 16. In a box making machine, a shaft, two cams thereon, means for rotating said shaft in one direction, a pair of transverse shafts, tables mounted on the transverse shafts, hubs on the transverse shafts, a roller carried by each of said hubs engaging one of said cams, an arm projecting from each of said hubs, an arm projecting from each of 11osaid tables, and an extension spring between each table arm and one of said hub arms, whereby the table is yieldingly operated in one direction.

17. In a box makingmachine, means for supporting the box comprising a pair of pivoted tables, each of said tables having a plurality of faces, a shaft, a pair of cams on thev shaft, a pair ofY shafts extending transversely of the rst shaft, said tables being mounted on the two transverse shafts,

' a hub fixed on each of the transverse shafts 1,144,4.er l

Supporting a box comprising a pair of pivoted tables, each table being formed with three supporting' faces, the said faces being at different distances from the axis of the tableand having beveled walls which act to lift the box heads slightly if necessary as the tables swing into supporting position.

19. In a box making machine, a carrier, a p air of arms pivoted to said carrier and arranged to support the shook as the latter is .carried forward, lugs on said arms for engaging behind the edge of the shook to move the same forward as the arms advance, pivoted supporting arms, a shoulder on each of the first arms en aged by one of said supporting arms, an a stop screw against which the supporting arms move and are arrested, whereby while the first arms continue forward toward the end of their stroke and their shoulders move out of engagement with the supporting arms and drop, they are out of contact with the shook during their return stroke.

20. In a box making machine, a carrier, a pair of arms pivoted to said carrier and arranged to support the shook as the latter is carried forward, lugs on said arms for engaging behind the edge of the shook -to move the same forwardas the arms advance, means for lowering said arms when near theend of their forward movement, shorter arms pivoted to the first arms, lugs on the shorter arms for engaging behind other pieces of shook, and means for depressing the shorter arn'isduring certain strokes.

21. In a box making machine, a carrier, a pair of arms pivoted to said carrier and arranged to support the shook as the latter lis carried forward, lugs on said arms for engaging behind the edge of the shook to more the same forward as the arms advance, means for lowering said arms when near the end of their forward movement, shorter arms pivoted to the first arms, lugs on the shorter arms for engaging behind other pieces of shook, a roller carried by each of the short arms, and a vertically movable frame with inclined ends against which said rollers are arranged to ride when said frame is in its lower position thereby dei pressing the said short arms.

Q2. In a box making machine, a carrier, a

pair of arms pivoted to said carrier and arranged to support the shook as the latter is carried forward, lugs on said arms forl engaging behind the edge of the shook to move the same forward as the arms advance, means for lowering said arms when near the end of their forward movement, shorter arms for engaging behind other pieces of shook, a roller carried by each of the short arms. Va verticall)7 movable frame with inclined ends against which said rollers are arranged to ride when said frame is in its lower position thereby depressing the said short arms, an arm on said frame, a roller on said frame arm, a cam for operating said lastmentioned roller to lift said frame at certain points in its cycle, and a starwheel with gearing for driving said cam.

23. In a box making machine, a carrier,

'a pivoted arm, links connecting the upper off-set extensions at their rear ends, said arms having shoulders, pivoted triggers on the carrier normally supporting said shoulders and having coperative relation with the opposite extensions, means for disengaging said triggers from said shoulders when said triggers are near the forward limit of their stroke. and a spring connecting each trigger with the associated off-set extension of each of the arms for moving the trigger underneath its shoulder when 4the arms are raised. t

25. In a box making-machine, a carrier, a pair of arms pivoted thereto and having off-set extensions at their rear ends, the arms having shoulders, pivoted triggers on the carrier normally supporting said shoulders, means for disengaging said triggers from said shoulders when said triggers are near the forward limit of their stroke, a spring connecting each trigger with the associated of`f-set extension of each of the arms for moving the trigger underneath its shoulder when theiarms are raised, and means for raising said arms comprising rollers carried on the arms and a stationary inclined way upon which said rollers ride'during the return stroke of the carrier.

QG. In a box making machine, a carrier, a pair of arms pivoted to said carrier and arranged to support the shook as the latter is carried forward, lugs on said arms for en- `raging behind the edge of the shook to move the same forward as the arms advance, means for lowering said arms when near the end of their forward movement, shorter arms pivoted to the lirst arms, lugs on the shorter arms for engaging behind other pieces of shook, a roller carried b v each of the short arms and a verticallv movable frame with inclined ends against which said rollers are arranged to ride when said frame is in its lower position thereby depressing the said short arms. said vertically movable frame having upwardly projecting extensions for supporting the shook.

27. In a box making machine, a carrier,

a pair, of arms pivoted to the carrier and having off-set ends, a second pair of arms pivoted tothe irst arms, the first and second arms having lugs on their upper edges, a pair vof triggers arrange to" engage and support the first mentioned arms during most of their forward movement, means for disengaging said triggers from -said lfirst mentioned arms when near the conclusion oft-heir forward movement, and springs Iextending from said triggersv to the olf-set ends of said arms, said springs being of a tension to permit the said first mentioned arms to dropslightly When released by said triggers and'to support the same after they 15 have dropped slightly.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 2d day of February, 1911.

ELMER o. NORTHRUP.

In the presence of- G. F. HACKLEY, FRANK L. A. GRAHAM. 

